javascript - How to share the scope within module.exports -


inside handler.js , have exported 2 functions. 1 initialize() , other handle(). initialize function use load handler dynamic based on application settings. , have shared variable var handler outside module.exports function.

handler = new handler(app); new instance created assign shared variable var handler. , inside handle() function shared variable var handler. used

dynamically require() file in web request time not idea. initialize() method created , called in application start time.

let me know suggestion remove shared variable 'handler'

var handler;  module.exports  = {      initialize : function (app){         var handler = require(path.resolve(app.basedir, app.settings.handler));         handler = new handler(app);     },      handle : function handle(ctx) {          var urltohandle = ctx.url;           return handler.resolveurl(ctx)         .then(function (json) {             ctx.layoutjson = json;             return ctx;         })         .catch(function (e) {             throw e;         });      } };

not sure if got right, if call initialize once can that:

var app     = require('path-to-a-file-which-return-app'); var handler = require(path.resolve(app.basedir, app.settings.handler)); var handler = new handler(app);  module.exports  = {      handle : function handle(ctx) {          var urltohandle = ctx.url;           return handler.resolveurl(ctx)         .then(function (json) {             ctx.layoutjson = json;             return ctx;         })         .catch(function (e) {             throw e;         });      } };

now require called once, since node cache you.


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